Automatic circuit breaker



Oct 25 1927 G. s. FISCHER AUTOMATIC CIRCUIT BREAKER Filed June 23. 1925 wm f IIIIIIIIAYIII. \V 4' Patented Oct. 25, 192'7.

UNITED STATES 1,646,904A PATENT OFFICE.

GEZA STEPHAN FISCHER, 0F BERLIN, GERMANY.

AUTOMATIC CIRCUIT .'BREAKER.

Application nled June 23, 1925, Serial No. 39,139, and in Germany April 18, 1925.

This invention relates to an improved automatic circuit breaker particularly 1ntended or designed and adapted for use 1n connection with an electric fiat-iron.

Stands for electric flat-irons have been suggested heretofore in which means are provided for automatically breaking the circuit through the weight of the iron as soon as the latter is placed upon the s tand. Stands of this type are commonly e uipped with quick-break switches of the k1n vgenerally employed in connection with lighting circuits, but switches of this kind frequently fail to work to satisfaction in connection with smoothing-irons requiring considerably'- higher loads than a mere' lighting circuit. For in switches of the stated kind a voltaic are'will sometimes be produced even in case of a slight unevenness of the contactlng surfaces only and the arc thus struck at a load of say 220 volt and 450 watt may have a length of 12 to 14 mm. and will not d1sappear, unless the length of the gap increases owing to the contact surfaces melt ino` oi to a certain amount.

illie object of this invention is to remedy? this defect and with this object in view provide a plurali of pairs of contact surfaces, by way of 'vision in order to avoid o sparking, so that each circuit breaker will have at least two pairs of contacts reciprocalllly acting as blow-out contacts upon each ot er.

The contact-lever, in this case, will act to multiply the minute breaking movement occurrin subsequently to placing the fiat-iron upon t e stand.

With the above recited and other objects in view reference is had tothe following specification and drawings in which there is exhibited one example or embodiment of the invention which is in no way intended as a limitation upon the scope of the appended claims as is to be clearly understood lthat variations andmodiiications which properly fall within the scope of said claim may be resorted to when found expedient.

In the drawings Figure 1 is a sectional elevation showing the new device in position of rest; Figure 2 is a similar view illustrating the device in working position prior to the breaking of the contact; Fi re 3 is a similar view showin the device 1n working position after thegbrcaking ofthe contact, and Figure 4 is a plan view of the contact lever, as well as a partial plan view of the the brackets on the top of the casing z for 'l coacting with the contact levers.

Parts which are repeated in the several figures bear the same reference characters in each case.'

Referring to the drawings the circuit breaker comprises a casing a, a push-bolt b, springs c and al coiled about the bolt b', limiting pins e and f in the bolt b for the two springs to abut against, a contact lever g and a contact yieldingly fixed to a baseplate z' supporting the several parts when assembled as shown in the drawings.

The top of the casing a and the base-plate z' have each an. opening and the two openings are vertically alined to act as a uiding means for the ush-bolt b housed wit in the casing a with reedom to move vertically or lengthwise therein. The reciprocatory movement of the bolt is controlled by the two springs. The side walls of the casing a have two slots diametricall op osite each other for the lever g to pass theretli the lever g has an elongated slot c for the bolt b to ass therethrough, the said slots being sizeeto allow the lever 4to freely play as required for a proper operation.v The sprin c is located between the upper pin c an the lever g so as to engage the latter in the vicinity of the slot whilst the rough and springy d is inserted .between or to abutwith contact ears m which are adapted to contact with the sides of the contact brackets. n on the base when the free endof the lever g is in engagement with the upper part of the contact 71l so that in the event of a faulty" connection at h the circuit will be made and broken by the coaction Ibetween elements m and n.

While .-in condition of rest the arts of the breaking device have adopted t 'e positions shown in Figure 1; Now, if the pushbolt b is forced down under a load or weight, in e will -act to compressthe spring c en t e lever g and, at t pin f and the base-plate.

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loss`y e same time, the

pin f will act to -compress the spring d o l and against the base-plate i, so that a clear;

way produced in the casing below thelever i g for the latter to descend, as will be readily understood on an ins ection ofFigure 2. v Upon the continue movement of the bolt shown in Figure 1.

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What I claim isi- An automatic circuit controller of the character described comprising a basel plate, spaced contacts thereon, a casing mounted onthe base plate and positioned between the in the side walls, a Contact lever pivoted to the casing for vertical Swingin movement and arranged through the openings therein for cooperating with the Contact, a bolt vertically sliclable through the casing lever and base plate, and coiled springs arranged above and belowthe lever and about the bolt and having their upper ends connected to the bolt, the upper spring acting to accelerate the short movement imparted to the pin and the lower spring acting to automatically return the parts to normalposition, substantially as and. for the purposes set forth.

In testimony whereof I atlx my signature.

D. lng. GEZA STEPHAN FlSCHER.

A contacts and provided withopposed openings 

